Abstract: In the process of metro construction, there are still many safety problems in the freezing method construction of connection passage. Taking the construction of 2# connection passage and pump room of Changjiang Road Station—Tayuan Road Station interval of Suzhou Rail Transit Line 5 as an example, the trend of surface settlement and deformation caused by the freezing method construction of connection passage in soft soil layer is analyzed according to monitoring data. Main conclusions are: the surface vertical displacement variation at the position of connection passage generally experiences five stages including drilling microchange, freezing uplift (frost heave), excavation undulation, thawing subsidence (thaw subsidence), and grouting stabilization; the surface maximum frost heave deformation of all sections perpendicular to central axis of connection passage is in the shape of a ‘convex semi-ellipse’, and the maximum thawing deformation is in V-shape; the surface deformation within a range of about 25 meters from the central axis of the connection passage is largely influenced by freezing method construction, and the impact beyond this range is relatively small.